I would say, part of what we look at are hard quantitative factors, but probably more important than the numbers are the soft qualitative attributes.

我想,我们看重的,是一些硬性的量化因素,这可能比那些抽象的特质属性,更为重要

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And there are some properties that are important to know.

我们应该知道笑的几个重要属性。

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By the way, that's a very remarkable property of the gravitational force-- the cancellation of the two ms.

顺便说一下,这是重力的一个重要属性,即可以消去等式两边的 m

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